fix(test): add xunit.runner.visualstudio for v3 test discovery

Without it, `dotnet test` reports "0 tests available" despite [Fact]
attributes; fix enables discovery of 40 tests. Also normalize ©.

Author: Jani Giannoudis

Client.Scripting.Tests/PayrollEngine.Client.Scripting.Tests.csproj

@@ -10,6 +10,10 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
     <PackageReference Include="xunit.v3" Version="3.2.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
   </ItemGroup>
 
   <ItemGroup>

Directory.Build.props

@@ -1,4 +1,4 @@
-<Project>
+<Project>
 
 	<PropertyGroup>
 		<TargetFramework>net10.0</TargetFramework>
@@ -7,7 +7,7 @@
 		<InformationalVersion></InformationalVersion>
 		<Authors>Jani Giannoudis</Authors>
 		<Company>Software Consulting Giannoudis</Company>
-		<Copyright>© 2026 Software Consulting Giannoudis</Copyright>
+		<Copyright>© 2026 Software Consulting Giannoudis</Copyright>
 		<Product>Payroll Engine Client Scripting</Product>
 		<PackageProjectUrl>https://payrollengine.org/</PackageProjectUrl>
 		<RepositoryUrl>https://github.com/Payroll-Engine/PayrollEngine.Client.Scripting.git</RepositoryUrl>